|
| Chapter 7 Basic Setting |
| Table 12 Basic Setting > Port Setup (continued) | |
| LABEL | DESCRIPTION |
| Flow Control | A concentration of traffic on a port decreases port bandwidth and overflows buffer |
|
| memory causing packet discards and frame losses. Flow Control is used to regulate |
|
| transmission of signals to match the bandwidth of the receiving port. |
|
| The Switch uses IEEE 802.3x flow control in full duplex mode and backpressure flow |
|
| control in half duplex mode. |
|
| IEEE 802.3x flow control is used in full duplex mode to send a pause signal to the |
|
| sending port, causing it to temporarily stop sending signals when the receiving port |
|
| memory buffers fill. |
|
| Back Pressure flow control is typically used in half duplex mode to send a "collision" |
|
| signal to the sending port (mimicking a state of packet collision) causing the sending |
|
| port to temporarily stop sending signals and resend later. Select Flow Control to |
|
| enable it. |
|
|
|
| 802.1p Priority | This priority value is added to incoming frames without a (802.1p) priority queue tag. |
|
| See Priority Queue Assignment in Table 10 on page 70 for more information. |
|
|
|
| PD | This field is only available on the PWR model but not available for the Gigabit or mini- |
|
| GBIC ports. |
|
| A powered device (PD) is a device such as an access point or a switch, that supports |
|
| PoE (Power over Ethernet) so that it can receive power from another device through a |
|
| 10/100Mbps Ethernet port. |
|
| Select the check box to allow a powered device (connected to the port) to receive |
|
| power from the Switch. |
|
|
|
| PD Priority | This field is only available on the PWR model but not available for the Gigabit or mini- |
|
| GBIC ports. |
|
| When the total power requested by the PDs exceeds the total PoE power budget on |
|
| the Switch, you can set the PD priority to allow the Switch to provide power to ports |
|
| with higher priority. |
|
| Select Critical to give the highest PD priority on the port. |
|
| Select High to set the Switch to assign the remaining power to the port after all critical |
|
| priority ports are served. |
|
| Select Low to set the Switch to assign the remaining power to the port after all the |
|
| critical and high priority ports are served. |
|
|
|
| Apply | Click Apply to save your changes to the Switch’s |
|
| these changes if it is turned off or loses power, so use the Save link on the top |
|
| navigation panel to save your changes to the |
|
| configuring. |
|
|
|
| Cancel | Click Cancel to begin configuring this screen afresh. |
|
|
|
| 75 |
|
|